Derivatives of phenylcinchoninic acid.



, useful Improvements I Phenylcmchonmlc Germany,

.tical value-are obtained by formula may contain an amino soluble inalkalis, soluble in acids, insoluble in water, soluble in hot-alco--hol; they are tasteless, whereby they are RUDOLF 'SC'HWABE;oEHocHste-oN-TH -MAIN;

VORM. MEISTER LUCIUS ,i PORATION OF GERMANY.

DERIVATIVES or PHENYLCINCHONINIC ACID? 4 No Drawing.

To all whom 2'25 may concern:

Be it known that chemist, a citizen of theiEmpire of residing atHochst-on-the-Main, have invented certain new. and in Derivatives ofAcid, of which the following 1s a specification.

Germany.

I have found that derivatives of the aphenylcinchoninic acid of greattherapeutransforming a-arylci'nchoninic acid into the correspond ingacid amids; by aryl being understood .an. aromatic residue which, mayContain 15 a kyloXy groups.

The process consists in treating with ammonia or an aliphatic amin thechlorids of the said acids, obtainable by heating afarylcinchoninicacidsvor an alkyloxy derivative thereof with thionyl chlorid.

he new products have a radical of the wherein aryl means an aromaticresidue, which may contain alkyloxy groups. They group, orthe hydrogenatoms of such group may be replaced by an alkyl. They are whitecompounds, in-

diluted mineral distinguished from the corresponding acids,

and are consequently more valuable f and.

suitable for therapeutical use than the acids. The following examplesillustrate my lnvention, the parts being by'weightz,

' separated by from diluted alcohol; it melts at 95 0., is.

Example I: 10 parts of oz-phenylcinchoni'nic acid chlorid are digestedat ordinary temperature with 10 parts of, diethyl-amin in an aqueoussolution of 10% strength until the yellow coloration of the acid chloridhas disappeared. The new compound is then filtration and recrystallizedtasteless, insoluble in water, readily soluble inhot alcohol,insolubleiin alkal1s, but dis- & BRfiNING; or HUCHST-QN-THE-MlhleSpecification of Letters Patent.- Application filed July 31, 1912.

I, RUDoLF So wABE,

GEniviANr, iissie'ndit '6, sites SerialNo.712,578.Y 1

solves in diluted mineral racids with formation of salts. v

Example II: 10 pasts of a (m-ethoxy phenyl) -cinchoninic acid chlorid'are intro Patented Aug. 5,1913. I

duced into 50 partsof concentrated aqueous ammonia (25% strength) and isstirred until the yellow acid .chlorid has disappeared. The amid thusobtained is separated by filtration and recrystallized from alcohol; ithas the for mula:

the mixture coloration of the it forms white needles melting at 216 C.;

it is tasteless, insoluble in water, soluble in.

iot alcohol, insoluble in ether; it dissolves in diluted hydrochloricacid and can be re precipitated by the addition of caustic soda Ive-Having now described my invention What I claim 1s:

1. As new formula wherein aryl means an aromatic residue, being white,tasteless compounds, insoluble in al-kalis, soluble in diluted mineralacids, insoluble in 'Water, soluble in hot alcohol.

2. As new products, the amids of oz-alkyloXyaryLcinchoninic acidscontaining the radical of the formula v I I I wherein ar'yl means anaromatic alkyltasteless comoxylated residue,'being white poundsinsoluble in alkalis, soluble in dis products, the amids of. arylcin=choninlc acids containing thevradlcal of the 216 0., insoluble in alkalis, solumeim di lubed mineral acids,'in o1ub1e ifl watel ,ssolu'- ble inhot alcoho.

In testimony whereof, Laflix my'signature 1 5 in presence of two,witnes'sesQ lubed miheral' acids, insoluble in water',-so1uv ble in hotalcohol. I 3. As a. new product, the ethoxyarylcin choninic acid amidof'the formulaz."

coma, o "RUDOLF SC WABE. \/-,kN m I v Witnesses:

. JEAN GRUND, crystallizing in white needles, melting jat CA L GRUND."

